Road scraper



y 7, 1934. E. L. SCHERMERHORN 1,966,935

ROAD SCRAPER Filed June 26, 1933 2 Sheets-Sheet 1 July 17, 1934. E; L.SCHERMERHORN 1,966,936

ROAD SCRAPER Filed June 26, 1933 2 Sheets-Sheet 2 Patented July 17, 1934UNITED STATES PATENT OFFHIE 9 Claims.

This invention relates generally to scraping mechanism and moreparticularly to a scraping attachment adapted to be positionedunderneath a truck chassis frame.

One objection to present day structures of this case lies in the factthat they utilize a rock shaft, this rock shaft extending substantiallythe length of the supporting beam, whereas in my novel construction Ieliminate this rock shaft with its appurtenant structure. I am able toaccomplish this reduction in structure by means of my novel arrangementof parts and such elimination decreases both the original constructioncost and the maintenance cost as well as facilitating initialinstallation and replacement due to the decrease in weight of thedevice.

Another advantage of my invention resides in the positioning oftherubber buffer members, these being readily removable and replaceable.

Another advantage resides in the positioning of the return spring forthe blade structure, this spring having its greatest pulling effect andits least leverage arm when the blade mechanism is in its lower positionand its greatest leverage arm and least pulling effect when the blade israised, such giving a substantially uniform effect whereby the piston ofthe hydraulic mechanism is returned to its initial position with aconstant velocity.

Yet another advantage resides in the novel blade construction, suchbeing reinforced by the welded angle members which are locatedimmediately adjacent its rear side. Also, the mold board supportingbrackets stiffen the blade structure near its ends.

Another advantage resides in the particular location of the trunnions ofthe cylinder base together with the conduit passing axially through oneof these trunnions.

Other advantages will become apparent as the description proceeds.

In the drawings:

Fig. 1 is a side view of my invention as applied to a truck chassisframe.

Fig. 2 is a plan view of the same.

Fig. 3 is a plan View of one end of the cross beam, part of thehydraulic cylinder and its mounting being shown in section.

Fig. 4 is a side view of the structure shown in Fig. 3.

Fig. 5 is a sectional view taken along the line 5-5 of Fig. 4.

Fig. 6 is a front elevation of the mold board supporting bracket.

and 6, has a recess 33 adapted to receive the Fig. 7 is an enlargedfragmentary cross sectional view of the stuffing box connection leadinginto the hollow trunnion of the cylinder base.

Similar numerals refer to similar parts throughout the several views.

Referring particularly to Figs. 1 and 2, numeral 10 indicates the truckchassis frame having posts 11 depending therefrom by means of theconnections 12, these posts being four in number and adjustablyreceiving the bearing ends 13 of thearc-shaped bars 14. These areshapedbars are preferably formed of angular members.

The cross beam 15 extends horizontally below the arc-shaped members 14and clamping plates 9, see Fig. 2, provide for circumferential movementof the beam 15 about the axis 16, a yoke member 17 maintaining the beamfrom lateral movement. The beam is bent downwardlyjat its center portionto provide clearance thereabove.

A supply pipe 19, adapted to receive pressure fluid from the flexibleconduit 18, lies alongside of the beam 15. See Figs. 1, 2, 3 and 4.

As shown in Fig. 2, hydraulic operating mechanism and spring retractingmechanism is located at each end of the beam 15, and as such structuresare identical, only one will be described.

Journal members 20, see Figs. 1 and 4, are located to the underside ofthe beam 15 in spaced relationship to each other and a short shaft 21extends therethrough, being held from endwise movement by the cotterpins. 22. The mold board supporting bracket, see Fig. 6, has arms 23,terminating in bearing members 24 extending upwardly therefrom, thesebearing members being pivotally mounted ,upon the shaft 21. Flanges 25extend laterally from the mold board supporting bracket and receive thebolts 26 whereby the same is rigidly attached to the angle member 30 andthe blade 40. A lug 27, see Figs. 4, 5 and 6, extends from one of theflanges 25 and receives one end of the coiled spring 28. The upper endof this coiled spring 28 is adjustably fastened as at 29 to the arm 31,this arm being fastened as at 32 to the end of the beam.

The mold board supporting bracket, see Figs. 5

head of the bolt 34, the shank of the bolt .34 detachably fitting intothe slot 35.

An actuating member 36, having an upwardly extending lever arm 3'7, hasa pivotal arm 38 which extends laterally and upwardly as shown in Fig. 1and which is pivotally mounted as at 39 on the central portion of theshaft 21. See Fig. 4.

The lower part of the actuating member 36 is rounded as shown in Fig. 4and has an opening 41 extending therethrough, this opening receiving thebolt member 34. A buffer cylindrical member 42, preferably formed withrubber, ex-

tends around theibolt 34 and is received between shaft which is usuallypresent in devices of this.

character. The mold board supporting brackets are freely pivoted uponthe shafts 21 and likewise the actuating members 36 are also freelypivoted upon these same shafts. The buffer members 42 arelooated'betweenthe actuating members and the depending bracket membersand these buffermembers transmitthe down-' ward force'from the'leverarm3'7 to the blade member 40, the buffer members yielding under excessivepressure or under shocks and impacts to damper out any vibrations due tothe blade meeting with an obstruction or the like.

The lever arm 37 is connected to and actuated by the piston 45; suchpiston-having a yoke 46 at its outer end, this yoke being 'con-" nectedat '47 to the upper end of the lever arm 37.

=See Figs. 1 and 3. A cylinder 48 threaded into The base the base 49receives the piston 45. 49 has trunnions 50, these trunnions 50 beingmounted in the extensions 51 and 52 of the bracket members '53 and 54,respectively. The

bracket members 53 and 54 are respectively provided with'f'a groove 55and a tongue56 whereby proper alinement may be had between the bearingson the extension-arms 51 and 52, respectively. Thus'the'trunnions 50 ofthe cylinder base 49 freely'rotate about their axes.

The trunnion 50, see Fig. 3, has a conduit 5'7 leading axiallytherefrom, the pressure conduit 19, previously referred to, beingconnected thereto by means of'the stufling box 58. As is shown in' Fig.7, a metal washer 59 located between the backing 60'and the outturnedflange 61 '01 the conduit 19, permits turning movement betweenthetrunnion 50 and the conduit 19.

A pipe -63 leading from and connected to the conduit- 57 by means of thestuffing box 64, enters the'end of the cylinder 48 at 65 and thus thepressure fluid may flow into the cylinder whereupon the fluid pushes thepiston'45 out wardly. This outward movement of the 'piston 45 moves thearm '3Ta'nd the actuating member 36 thus" causing movement about theshaft 21. The buffer-member 42 transmits this pressure to the mold boardsupporting bracket, which is freely pivoted upon the shaft 21, and thusthe blade and its reinforcing structure is forced downwardly tooperative position as shown in Fig. 1.

Whenever the pressure is released from the operating fluid, the coiledsprings 28 contact and raise the blade from its operative position, andexert pressure in a reverse manner so that the pistons 45 traveling intothe cylinders 48 force the hydraulic pressure fluidback through theconduits 19 and 18. It is to be noted that the springs 28 act upon thescraping blade structure and hence through the buffer members 42, thusgiving a dampened and even pressure upon the pistons 45 whereby shockswill be eliminated.

Also, the springs 28 are located at an angle to the vertical whereby theeffective lever arms, as shown in Fig. l, are at a minimum when thesprings are fully extended and as the blade is lifted'thelength 'ofthese lever arms. increases in order to compensate for thediminishedpulling effect of the springs 28. Thus a substantially.

constant pulling effect is had through the yielding buffer means 42.

As shown in Fig; 3, a' tongue 56 extends. into the recess 55 of theadjacent bracket member and these snugly engage in order to properlymount the trunnions 501 Also, this construction permits the insertionof;an extra bolt passing downwardly therethrough' to mount the same uponthe beam 15.

As the scraper blade is raisedfrom the position shown in Fig. 1, thelever arm 37 moves rearwardlyr and also upwardly and thus the trunnions50 turn slightly in the extension arms .51 and 52 and this is taken careof by the stuffing box constructionshown in Fig. 7, such'permittingcircumferential movement between the trunnion 50-and the conduit 19Without limitingmyself to the particular embodiments of my inventionillustrated and explained above, and desiring to protect my invention inthe broadest manner legally possible, I What I claim is:"

1. In a road scraping mechanism of the class described, the combinationof,.a truckchassis frame having four spaced apart posts mounted.thereon, arc-shaped bars. horizontally mounted upon said posts forvertical movement thereon, a horizontal-beam adjustably mounted on saidarc-shaped bars, hydraulic means located on said beam, a scraping bladepivotally mounted on said beam, means interconnecting the hydraulicmeans and the beam whereby introduction of pressure fluid in thehydraulicmeans will cause actuation thereof andmove the blade withrespect to the said beam, said hydraulic means including a cylinder anda cylinder base with trunnions pivotally'mounted on the said beam, oneof said trunnions having a passageway axially therein, means forsupplying fluid to said passageway and means leading from saidpassageway to the interior of 1 the cylinder forv the purpose described.

2. In a road scraper having a cross beam, two spaced apart mold boardsupporting brackets pivotally attached thereto, two actuating memberspivoted adjacent said brackets, buffer means between said actuatingmembers and said brackets, a scraping blade fastened to said mold boardsupporting brackets and means for moving said actuating members.

3. In a device of the classdescribed, a beam,

means for mounting said beam, journal members 1504 loeate'd err-saidbeam in spaced relation to each other} mold board supporting bracketspivoted for free eperation upon said journals, blade mechanism includingtwo angles welded together and a blade/bolted to said angles attached:to said mold board supporting brackets, and buifer means for exertingpressure upon said blade mechanism for the purpose described.

4. A combination of elements as set forth in claim 3 in which actuatingmembers operate said bufiers, said actuating members being pivoted uponthe said journal for free pivotal movement thereon.

5. In a device of the type described having a beam with a scraping bladepivotally mounted thereon, the combination of, bui'er' means locatedrearwardly of said blade, pivoted means having surfaces abutting againstbuffer means, and hydraulic means including a cylinder, a piston slidingin said cylinder, means con.- necting said piston to the said pivotedmeans,. a cylinder base having trunnions laterally extending therefrom,extensions adapted to receive said trunnions, and guiding means betweensaid extensions to properly aline the same whereby the cylindrical basetrunnions will freely i'lurnabout their axes.

6. In combination, a cross beam, a pair :11" spaced journal memberslocated at each end thereof, shafts extending through each of said pairsof journal members, a mold board support-- ing bracket pivoted upon anddepending from each of said shafts, blade mechanism mounted upon saidbrackets, an actuating member pivoted upon each of said shafts, andrubber means located between said actuating members and the said moldboard supporting brackets.

7. A combination of elements as set forth in claim 6 in which saidrubber means has a hole therethrough, bolt means extending through thesaid hole and also through the said actuating member, the mold boardsupporting brackets each having a slot therein adapted to detachablyreceive the head of said bolt therein.

8. A combination of elements as set forth in claim 6 in which said bladeconstruction includes two angles rigidly attached to its rear face forthe purpose described.

9. In a scraper structure, the combination of, an adjustable supportingbeam, journal meansmounted below each end of the said adjustablesupporting beam, shafts positioned in said journal means, moldboardsupporting brackets; pivotally mounted one on each of the said shafts,actuating members also mounted one on each of said shafts, each of saidactuating members having an arm extending upwardly therefrom, scrapingmeans rigidly attached to saidv moldboard supporting brackets, yieldablemeans; located between said moldboard supporting: brackets and theactuating members and means for moving the said arms of the saidactuating members for the purpose described.

EUGENE L. SCHERlVERI-IOBN;

